This data set consists of one TIFF, one JPEG image, and one PDF map of airborne magnetic total field, calculated first vertical derivative and calculated second vertical derivative covering most of northern mainland Nova Scotia. Also included in this data set is 20 PDF maps of calculated first vertical derivative for each of the 1:50 000 NTS Mapsheets in northern mainland Nova Scotia, and 16 PDF maps of calculated second vertical derivative for each of the mapsheets excluding: 21H/16, 11E/13, 11E/14 and 11E/15.
The data used to generate these images and maps were supplied by the Geological Survey of Canada - Geophysical Data Centre, 615 Booth St., Ottawa, Ontario, K1A 0E9, and the Radiation Geophysics Division, 601 Booth St., Ottawa, Ontario, K1A 0E8. The original magnetic data were acquired as part of: Project #102 "Antigonish Survey", Project #127 "Guysborough Survey", Project #184 "Musquodoboit Survey", Project #189 "Parrsboro Survey" and Project #152 "St. Mary's River Survey".
Map coverage was locally augmented by older vintage GSC analogue data. The MAGNETIC TOTAL FIELD images (and other subsequent images) were derived from the levelled and decorrugated measured magnetic total field. The ENHANCED MAGNETIC DATA (First and Second Vertical Derivative) images enhance near-surface magnetic sources at the expense of deeper features, with the Second Vertical Derivative data representing more shallow (< 500m depth) sources. Zero value gradient contours also correlate closely with the vertical projection of magnetic contacts.The 24-bit colour images were produced with a 25 m pixel size. Shading was from the south at 35° above the horizon. For complete details an Open File Report will be forthcoming from M. S. King later in 2004.
The images were produced by contractor M. S. King using funds provided under the Natural Resources Canada and Nova Scotia Department of Natural Resources joint project 'Mapping, Mineral and Energy Resource Evaluation, Central Nova Scotia', part of Natural Resources Canada's Targeted Geoscience Initiative (TGI-2) 2003-2005.
The information on the PDF map comes from a variety of government and non-government sources. NSDNR accepts no liability for any errors or deficiencies on this map. This map should not be used for legal purposes.
The PDF map is intended for use at the published scale of 1:50 000.
The DATA is provided to the USER on an "as is" basis, without warranties of any kind, express or implied. The entire risk as to the quality and accuracy of the DATA is with the USER and the USER shall use his/her own judgment in making use of the DATA or drawing conclusions based upon it. DNR shall not be liable to the USER, his/her clients, servants, agents, contractors, assigns, or to any other person for any loss or damage of any kind including personal injury or death arising from the use of the DATA or accompanying written materials, or from errors, deficiencies or faults therein, whether such damage is caused by negligence or otherwise. If errors or omissions are found in the DATA, the USER will notify DNR. The terms and conditions of the license accompany the downloaded digital product.
(Sample image - Click to view details in a smaller area )
Portable Document Format (PDF), Tag Image File Format (TIFF), Joint Photographic Experts Group (JPEG) and TXT files compressed in self-extracting EXE/ZIP files (more information on data formats)
PDF - 1.0 to 14.5 MB (compressed), 1.1 to 15.9 MB (uncompressed)
TIFF - 15.2 to 35.6 MB (compressed), 89.7 to 136.8 MB (uncompressed)
JPEG - 4.6 to 9.3 MB (compressed), 4.7 to 9.4 MB (uncompressed)
The TIFF and JPEG images are in six-degree Universal Transverse Mercator (UTM) projection, Zone 20, Central Meridian 63° 00' West using the North American Datum of 1983 (NAD83).
The PDF maps are are in six-degree Universal Transverse Mercator (UTM) projection, Zone 20, Central Meridian 63° 00' West using the North American Datum of 1927 (NAD27).
The data files have been compressed using PKZIP into a single, self-extracting EXE file.
The EXE file can also be opened in WinZip to view and extract the compressed files in the data set.
On UNIX platforms, the unzip command will extract the compressed files in the EXE.
A readme file and a copy of the licence agreement are also included with each data set.